/* ***** BEGIN LICENSE BLOCK *****
 * Distributed under the BSD license:
 *
 * Copyright (c) 2012, Ajax.org B.V.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Ajax.org B.V. nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL AJAX.ORG B.V. BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * ***** END LICENSE BLOCK ***** */

define(function(require, exports, module) {
"use strict";

exports.parForEach = function(array, fn, callback) {
    var completed = 0;
    var arLength = array.length;
    if (arLength === 0)
        callback();
    for (var i = 0; i < arLength; i++) {
        fn(array[i], function(result, err) {
            completed++;
            if (completed === arLength)
                callback(result, err);
        });
    }
}

var ID_REGEX = /[a-zA-Z_0-9\$-]/;

exports.retrievePrecedingIdentifier = function(text, pos, regex) {
    regex = regex || ID_REGEX;
    var buf = [];
    for (var i = pos-1; i >= 0; i--) {
        if (regex.test(text[i]))
            buf.push(text[i]);
        else
            break;
    }
    return buf.reverse().join("");
}

exports.retrieveFollowingIdentifier = function(text, pos, regex) {
    regex = regex || ID_REGEX;
    var buf = [];
    for (var i = pos; i < text.length; i++) {
        if (regex.test(text[i]))
            buf.push(text[i]);
        else
            break;
    }
    return buf;
}

});